7D or 550

I have decided to switch from Sony to Canon. I now own a Sony d200 and was thinking about the d550 but the reviews have left me “cold”. Since I can trade in my Sony camera and Tamron lens…starting fresh I thought I had narrowed it down to the 7D. Then I read about the Canon 550 and I am wondering if that camera at the price would be a better buy for me. I am an advance amateur with DSLR was near pro with SLR. I really need input; I don’t want to make a mistake, what are your thoughs?